Do any of you know universities in Japan that hire English teachers who are over 70 years old? I'm writing on behalf of my own dear father, who will turn 71. He's been teaching in Japan for over 35 years at different universities, is healthy, and wants to continue teaching because he says he loves it. He's got a MATESOL and some publications.

For full-time, I'd say he should not count on any being available for him. For part-time, even Japanese teachers (of any subject) find it hard to get after retirement age. Like I wrote earlier, with his 35 years of experience here, he should already know the ropes, and I would suspect he has made enough contacts to know where to apply and who to ask.